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Q1. | Curl of gradient A is |

A. | ∇ x (∇A) = 1 [Wrong Answer] |

B. | ∇ x (∇A) = ∞ [Wrong Answer] |

C. | ∇ x (∇A) = 0 [Correct Answer] |

D. | ∇ x (∇A) = - ∞ [Wrong Answer] |

View Answer
Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ Consider the differential amplifier shown in figure. (Assume β is very hi

5 V

10 V

15 V

30 V

⇒ Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr.

28000

15000

36000

11100

⇒ The effective electrical length of an antenna is __________ its physical length

greater than

equal to

less than

none of the above

⇒ The inductance of a single layer solenoid of 10 turns is 5 μH. Which one of the following is the correct value of inductance when the number of turns is 20 and the length is doubled.

10 μH

20 μH

40 μH

5 μH

⇒ A typical error rate on satellite circuits is one bit error in

10

^{7}

10

^{3}

10

^{2}

10

^{10}

⇒ Consider the following statements:

- The positiveness of coefficients of characteristic equation is necessary as well as sufficient condition for stability of first and second order systems.
- The positiveness of coefficients of characteristic equation ensures negativeness of real roots but is not sufficient condition for stability of third and higher order systems.

only 1 is correct

both 1 and 2 are correct

only 2 is correct

both are wrong

⇒ In energy band diagram of

*n*type semiconductor, the donor energy level is

in valence band

in conduction band

slightly above valence band

slightly below conduction band

⇒ Which one of the following is applicable to any network-linear or non-linear, active or passive, time-varying or invariant - as long as Kirchhoff laws are

*not*violated?

Tellegen's theorem

Reciprocity theorem

Maximum power transfer theorem

Superposition theorem

⇒ Three phase four wire induction energy meter is used to measure

energy in 3 phase balanced star load

energy in 3 phase balanced delta load

energy in 3 phase unbalanced load

either (a) or (b)

⇒ The message carrying efficiency is best in

AM

FM

AM-SC

Phase modulation

⇒

**Assertion (A):** Negative values of incremental operator in DO loop are allowed in Fortran 77 but not in earlier versions of Fortran.

**Reason (R):** Fortran 77 has better array facilities than earlier versions of Fortran.

Both A and R are correct and R is correct explanation of A

Both A and R are correct but R is not correct explanation of A

A is correct R is wrong

A is wrong R is correct

⇒

**Assertion (A):** A dual converter may be circulating current type or non circulating current type.

**Reason (R):** In circulating current dual converter only one converter can be operated at one time.

Both A and R are correct and R is correct explanation of A

Both A and R correct but R is not correct explanation of A

A is correct but R is wrong

A is wrong but R is correct

⇒ In TV transmitter, visual exciter may consist of

- Video processing unit
- Visual modulator
- VSB filter
- Delay equaliser
- Frequency converter

1, 2 and 3

2, 3 and 4

1, 2, 3 and 4

1, 2, 3, 4 and 5

⇒ The dimensions of force are

MLT

^{-2}

ML

^{-1}T

^{-2}

MLT

^{-1}

ML

^{2}T

^{-2}

⇒ Which is correct for a transfer function?

The poles and zero must be complex

If the poles and zeros are complex or imaginary, they must be conjugate

If the poles and zeros are complex they must be simple

If a zero is imaginary, it must be simple

⇒ In a series circuit with fixed R and variable X

_{L}, the current locus lies in the fourth quadrant.

TRUE

FALSE

⇒ Among the various modulation systems, the most favoured from the point of linearity of modulation and efficiency is

anode or collector modulation

central grid modulation

screen grid modulation

modulated oscillators

⇒ Which of the following expressions is true for apparent power in an A.C. circuit?

VI cos Φ

V

_{av}x I

_{av}

V

_{r.m.s}x I

_{r.m.s}

V

_{peak}x I

_{peak}

⇒ It is known that noise phase modulates the FM wave. As the noise side band frequency approaches the carrier frequency, the noise amplitude

will increase

will decrease

will remain constant

will reduce to negligible value

⇒ Which of the following needs DC forward voltage to emit light?

LED

LCD

Both LED as well as LCD

None of the above

⇒ The gain of an FET amplifier can be changed by changing

*r*

_{m}

*g*

_{m}

R

_{d}

none of the above

⇒ For the K map of the given figure, the simplified Boolean expressio

A C + A D + ABC

A B D + BC

A C D + AC

A C D + AC + BC

⇒ What will be the propagation constant at 10 MHz?

3.4 radians/km

34.4 radians/km

344 radians/km

3440 radians/km

⇒ A line has standing waves with a voltage maximum of 35 mV and minimum of 17.5 mV VSWR is

2

4

0.5

0.25

⇒ A heater is rated at 230 V, 5 A AC. Then

both the current and voltage are peak values

both the current and voltage are rms values

the current is peak value and voltage is rms value

the current is rms value and voltage is peak value

⇒ NMOS devices have __________ switching speeds and __________ on-state resistance; as compared with PMOS devices.

slower, higher

faster, lower

faster, higher

slower, lower

⇒ The electric energy required to raise the temperature of a given amount of water is 1000 kWh. If heat losses are 25%, the total heating energy required is __________ kWh.

1500

1250

1333

1000

⇒

Match the following:

List I (Instruction) | List II (Flag's getting affected) | ||
---|---|---|---|

A. | ORI | 1. | CY reset |

B. | DAA | 2. | CY reset and AC reset |

C. | PCHIL | 3. | S, Z, AC, P, CY flags affected |

4. | S, S, P are modified | ||

5. | No flags affected |

A-2, B-3, C-5

A-4, B-3, C-5

A-1, B-2, C-3

A-2, B-4, C-1

⇒ In figure, I = 2A, then

5 V

3 V

2 V

1 V

⇒ Two resistors

*R*

_{1}= 36 Ω ± 5% and

*R*

_{2}= 75 Ω ± 5% are connected in series. The total resistance is

111 ± 0 Ω

111 ± 2.778 Ω

111 ± 5.55 Ω

111 ± 7.23 Ω